.news-lf_angle {
    margin: 50px 0 100px;

}
.news-main{position: relative;}
/* 五个模块的大小背景等样式 */
.news-main>div {
    height: 450px;
    width: 1242px;
    background-color: rgba(255, 255, 255, .2);
    box-shadow: 0px 4px 60px rgba(255, 255, 255, .25);
    margin-bottom: 200px;
    position: relative;
}

/* 设置模块浮动 */
.news-main-right {
    float: right;
}

.news-main-left {
    float: left;
}

/* 文本字体样式 */
h1 {
    color: #fff;
    font-size: 48px;
    margin: 25px 0 25px;
}

/* 年份后面的细白线 */
.line {
    width: 0;
    height: 0;
    border-top: 3px solid #fff;
    position: absolute;
    top: 56.2px;
    left: 150px;
}
/* 白线小动画 */
.news-main-right:hover .line,
.news-main-left:hover .line {
    width: 269px;
    transition: 1.2s;
}

h3 {
    color: #fff;
    font-size: 24px;
    width: 601px;
    margin-bottom: 15px;
}

h3.grey-text {
    color: #808080;
    width: 621px;
    line-height: 33.6px;
    margin-bottom: 0;
}

/* 文字介绍外div盒子的大小 */
.news-main_text {
    width: 621px;
    height: 100%;
}

/* 文字介绍盒子设置绝对定位摆放 */
.news-main_1_text,
.news-main_3_text,
.news-main_5_text {
    position: absolute;
    right: 55px;
}

.news-main_2_text,
.news-main_4_text {
    position: absolute;
    left: 55px;
}

/* 左右箭头 */
.news-al,
.news-ar {
    width: 50px;
    height: 80px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    display: none;
    z-index: 99;
}

.news-al {
    left: 0;
    background-image: url(../Image/news/left\ slide.png);
}

.news-ar {
    right: 0;
    background-image: url(../Image/news/right\ slide.png );
}

/* 连接线的放置 */
.light {
    height: 350px;
    width: 1350px;
    position: absolute;
    z-index: 99;
    background-repeat: no-repeat;
}
.light1{
    top: 350px;
    left: 40px;
    background-image: url(../Image/news/chuanshengtong-big-1.png);
}
.light2{
    top: 1000px;
    left: 100px;
    background-image: url(../Image/news/chuanshengtong-big-2.png);
}
.light3{
    top: 1650px;
    left: 40px;
    background-image: url(../Image/news/chuanshengtong-big-1.png);
}
.light4{
    top: 2300px;
    left: 100px;
    background-image: url(../Image/news/chuanshengtong-big-2.png);
}

.backtop{
    position: fixed;
    width: 100px;
    height: 100px;
    right: 20px;
    border-radius: 50%;
    background-color: rgba(80, 80 ,80, .8);
}
